This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 1 Solid State – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 1 Solid State Quiz 1 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The correct order to the packing efficiency in different types of unit cells is ..... A) FCC B) FCC>BCC>Sc. C) FCCSc. D) BCCSc. Show Answer Correct Answer: B) FCC>BCC>Sc. 2. What are phonons in the context of solid-state physics? A) Elementary excitations representing atomic lattice vibrations. B) Particles that carry electric charge. C) Atoms in a crystal lattice. D) None of the above. Show Answer Correct Answer: A) Elementary excitations representing atomic lattice vibrations. 3. In a Joule-Thomson expansion, cooling occurs when: A) The inversion temperature is below the gas temperature. B) The inversion temperature is above the gas temperature. C) The process is adiabatic. D) The process is isothermal. Show Answer Correct Answer: B) The inversion temperature is above the gas temperature. 4. What is a common use for memory cards? A) Desktop computer storage. B) Operating system installation. C) Digital cameras and camcorders. D) Storing large databases. Show Answer Correct Answer: C) Digital cameras and camcorders. 5. What is the total number of atoms per unit cell in a face centered cubic structure? A) 1. B) 2. C) 3. D) 4. Show Answer Correct Answer: D) 4. 6. The limiting value of CsCl. is ..... A) 0.732. B) 1.0. C) 0.93. D) 0.414. Show Answer Correct Answer: C) 0.93. 7. In CsCl the coordination number is ..... A) 8:8. B) 6:6. C) 4:4. D) 8:4. Show Answer Correct Answer: A) 8:8. 8. Top down technology refers to nanomaterials as A) Making structures by machining and etching technique. B) By sputtering technique. C) Using thin films. D) Using molecular technique. Show Answer Correct Answer: A) Making structures by machining and etching technique. 9. A metal crystallizes in a body-centered cubic structure. If 'a' is the edge length of its unit cell, 'r' is the radius of the sphere. What is the relationship between 'r' and 'a'? A) $r=\frac{\sqrt[]{3}}{4}a$. B) $r=\frac{a}{2}$. C) $r=\frac{a}{2\\sqrt[]{2}}$. D) None of these. Show Answer Correct Answer: A) $r=\frac{\sqrt[]{3}}{4}a$. 10. Discuss the dielectric properties of materials in the context of solid state physics. A) Dielectric properties are determined by the color of materials. B) Dielectric properties are related to the mechanical strength of materials. C) Dielectric properties are only relevant in liquid state physics. D) Dielectric properties of materials in solid state physics relate to their ability to store electrical energy in an electric field, characterized by permittivity. Show Answer Correct Answer: D) Dielectric properties of materials in solid state physics relate to their ability to store electrical energy in an electric field, characterized by permittivity. 11. The order of magnitude of the energy gap of a typical semiconductor is A) 0 eV. B) 1-6 eV. C) 10 eV. D) 9 eV. Show Answer Correct Answer: B) 1-6 eV. 12. Number of atoms in a body centered unit cell A) 1. B) 2. C) 3. D) 4. Show Answer Correct Answer: B) 2. 13. Flame proof motors are used in A) Paper Mills. B) Steel mills. C) Moist atmospheres. D) Explosive atmospheres. Show Answer Correct Answer: D) Explosive atmospheres. 14. AN ANGLE OF FOUR FOLD AXIS OF SYMMETRY IS ..... A) 360. B) 120. C) 90. D) 60. Show Answer Correct Answer: C) 90. 15. What is the effect of increasing temperature on the electrical conductivity of metals A) Increases. B) Decreases. C) No change. D) Can't predicted. Show Answer Correct Answer: B) Decreases. 16. Which Cubic cell has highest packing fraction? A) SC. B) BCC. C) FCC. D) No One. Show Answer Correct Answer: C) FCC. 17. Number of atoms per unit cell in FCC lattice is ..... A) 1. B) 2. C) 3. D) 4. Show Answer Correct Answer: D) 4. 18. Which of the following crystals has the largest lattice energy A) KCL. B) RbI. C) Mgo. D) NaF. Show Answer Correct Answer: C) Mgo. 19. Which of the following is dynamic braking? A) Reversal of field connections. B) Reversal of armature connections. C) Addition of equal and opposite field. D) Removal of armature circuit from current machine circuit. Show Answer Correct Answer: D) Removal of armature circuit from current machine circuit. 20. Which of the following oxides shows electrical properties like metals? A) SiO$_{2}$. B) MgO. C) SO$_{2}$. D) CrO$_{2}$. Show Answer Correct Answer: D) CrO$_{2}$. 21. Which device can be used in a chopper circuit? A) GTO. B) IGBT. C) MOSFET. D) ALL. Show Answer Correct Answer: D) ALL. 22. Value of '' i" for acetic acid in benzene is A) I > 1. B) I < 1. C) I =1. D) None of the above. Show Answer Correct Answer: B) I < 1. 23. Dv/dt protection is provided to the SCR by A) Connecting a capacitor in parallel with the load. B) Connecting an inductor in series with the load. C) Connecting a capacitor & resister in parallel with the device. D) Connecting an inductor & resister in parallel with the device. Show Answer Correct Answer: C) Connecting a capacitor & resister in parallel with the device. 24. A solid having ccp array, has two atoms P and Q. P occupies lattice points and Q all the octahedral voids. What is the formula of the compound A) PQ. B) PQ$_{2}$. C) P$_{2}$Q. D) None of the above. Show Answer Correct Answer: A) PQ. 25. The number of atoms in 100 g of a face crystal with density = 10 g/cm and cell edge equal to200 pm is equal to. A) 5x10$^{24}$. B) 5x10$^{25}$. C) 6x10$^{23}$. D) 2x10$^{25}$. Show Answer Correct Answer: A) 5x10$^{24}$. 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